Tire comprising a composition comprising a zinc diacrylate derivative and a peroxide

Abstract

The invention relates to a tire provided with a tread, said tread comprising a rubber composition based on at least one diene elastomer, a zinc diacrylate derivative in the form of a zinc salt in which R1, R2 and R3 independently represent a hydrogen atom or a C1-C7 hydrocarbon group selected from linear, branched or cyclic alkyl groups, aralkyl groups, alkylaryl groups and aryl groups, which are optionally interrupted by one or more heteroatoms, R2 and R3 being able to form together a non-aromatic ring, and a peroxide. The contents of zinc diacrylate derivative and peroxide are such that the ratio of the peroxide content to the zinc diacrylate derivative content is less than or equal to 0.09, said composition comprising no reinforcing filler or comprising less than 50 phr thereof, the ratio of the filler content to the zinc diacrylate derivative content being less than or equal to 2.

The invention claimed is: 
     
       1. A tire provided with a tread, said tread comprising a rubber composition comprising:
 at least one diene elastomer; 
 a zinc diacrylate derivative in the form of a zinc salt of formula (I) 
 
       
         
           
           
               
               
           
         
         
           wherein R1, R2 and R3 independently represent a hydrogen atom or a C1-C7 hydrocarbon group selected from linear, branched or cyclic alkyl groups, aralkyl groups, alkylaryl groups and aryl groups, which are optionally interrupted by one or more heteroatoms, R2 and R3 being able to form together a non-aromatic ring; and 
         
         a peroxide, 
         wherein a ratio of the peroxide content to the zinc diacrylate derivative content is from more than 0 to 0.09, 
         wherein the rubber composition comprises from 5 to 45 phr of a reinforcing filler, and 
         wherein a ratio of the reinforcing filler content to the zinc diacrylate derivative content is within a range extending from 0.7 to 1.3. 
       
     
     
       2. The tire according to  claim 1 , wherein the rubber composition comprises no reinforcing filler. 
     
     
       3. The tire according to  claim 1 , wherein R1, R2 and R3 independently represent a hydrogen atom or a methyl group. 
     
     
       4. The tire according to  claim 1 , wherein R2 and R3 each represent a hydrogen atom. 
     
     
       5. The tire according to  claim 1 , wherein R1 represents a methyl group. 
     
     
       6. The tire according to  claim 1 , wherein the zinc diacrylate derivative content is within a range extending from 10 to 50 phr. 
     
     
       7. The tire according to  claim 6 , wherein the zinc diacrylate derivative content is within a range extending from 20 to 30 phr. 
     
     
       8. The tire according to  claim 1 , wherein the peroxide is an organic peroxide. 
     
     
       9. The tire according to  claim 1 , wherein the peroxide content is from more than 0 to 3 phr. 
     
     
       10. The tire according to  claim 1 , wherein the peroxide content is within a range extending from 0.1 to 3 phr. 
     
     
       11. The tire according to  claim 1 , wherein the peroxide content is within a range extending from 0.2 to 2 phr. 
     
     
       12. The tire according to  claim 11 , wherein the peroxide content is within a range extending from 0.25 to 1 phr. 
     
     
       13. The tire according to  claim 1 , wherein the ratio of the peroxide content to the zinc diacrylate derivative content is from more than 0 to 0.05. 
     
     
       14. The tire according to  claim 13 , wherein the ratio of the peroxide content to the zinc diacrylate derivative content is from more than 0 to 0.04. 
     
     
       15. The tire according to  claim 14 , wherein the ratio of the peroxide content to the zinc diacrylate derivative content is from more than 0 to 0.02. 
     
     
       16. The tire according to  claim 1 , wherein the diene elastomer is selected from the group consisting of polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and mixtures thereof. 
     
     
       17. The tire according to  claim 16 , wherein the diene elastomer is selected from the group consisting of polybutadienes, synthetic polyisoprenes, natural rubber, copolymers of butadiene and styrene, copolymers of butadiene and acrylonitrile, copolymers of isoprene and styrene and mixtures thereof. 
     
     
       18. The tire according to  claim 1 , wherein the reinforcing filler content is within a range extending from 10 to 40 phr. 
     
     
       19. The tire according to  claim 18 , wherein the reinforcing filler content is within a range extending from 15 to 35 phr. 
     
     
       20. The tire according to  claim 1 , wherein the reinforcing filler is carbon black, silica or a mixture of carbon black and silica. 
     
     
       21. The tire according to  claim 20 , wherein the reinforcing filler predominantly consists of carbon black. 
     
     
       22. The tire according to  claim 1 , wherein the rubber composition contains from 0 to less than 0.5 phr molecular sulphur or sulphur donor as vulcanizing agent. 
     
     
       23. The tire according to  claim 22 , wherein the rubber composition contains from 0 to less than 0.3 phr molecular sulphur or sulphur donor as vulcanizing agent. 
     
     
       24. The tire according to  claim 23 , wherein the rubber composition contains from 0 to less than 0.1 phr molecular sulphur or sulphur donor as vulcanizing agent. 
     
     
       25. The tire according to  claim 24 , wherein the rubber composition contains no molecular sulphur or sulphur donor as vulcanizing agent. 
     
     
       26. The tire according to  claim 1 , wherein the rubber composition contains no vulcanization accelerator. 
     
     
       27. The tire according to  claim 1 , wherein the rubber composition contains no antioxidant. 
     
     
       28. The tire according to  claim 1 , wherein the rubber composition additionally comprises a plasticizer. 
     
     
       29. The tire according to  claim 28 , wherein the plasticizer is selected from the group consisting of plasticizing resins, extender oils and mixtures thereof.